High Energy And Power Density Asymmetric Supercapacitors Using Electrospun Cobalt Oxide Nanowire Anode

Vidhyadharan, Baiju and Radhiyah, Abd Aziz and Izan Izwan, Misnon and Kumar, Gopinathan M. Anil and Jamil, Ismail and M. M., Yusoff and Rajan, Jose (2014) High Energy And Power Density Asymmetric Supercapacitors Using Electrospun Cobalt Oxide Nanowire Anode. Journal of Power Sources, 270. pp. 526-535. ISSN 0378-7753. (Published)

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Electrochemical materials are under rigorous search for building advanced energy storage devices. Herein, supercapacitive properties of highly crystalline and ultrathin cobalt oxide (Co3O4) nanowires (diameter ∼30–60 nm) synthesized using an aqueous polymeric solution based electrospinning process are reported. These nanowire electrodes show a specific capacitance (CS) of ∼1110 F g−1 in 6 M KOH at a current density of 1 A g−1 with coulombic efficiency ∼100%. Asymmetric supercapacitors (ASCs) (CS ∼175 F g−1 at 2 A g−1 galvanostatic cycling) are fabricated using the Co3O4 as anode and commercial activated carbon (AC) as cathode and compared their performance with symmetric electrochemical double layer capacitors (EDLCs) fabricated using AC (CS ∼31 F g−1 at 2 A g−1 galvanostatic cycling). The Co3O4//AC ASCs deliver specific energy densities (ES) of 47.6, 35.4, 20 and 8 Wh kg−1 at specific power densities (PS) 1392, 3500, 7000 and 7400 W kg−1, respectively. The performance of ASCs is much superior to the control EDLCs, which deliver ES of 9.2, 8.9, 8.4 and 6.8 Wh kg−1 at PS 358, 695, 1400 and 3500 W kg−1, respectively. The ASCs show nearly six times higher energy density (∼47.6 Wh kg−1) than EDLC (8.4 Wh kg−1) without compromising its power density (∼1400 W kg−1) at similar galvanostatic cycling conditions (2 A g−1).

Item Type: Article
Uncontrolled Keywords: Electrochemical energy storage; Hybrid capacitors; Renewable energy; Metal oxide semiconductors; Batteries; One dimensional nanostructures
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 25 Aug 2014 08:31
Last Modified: 22 Jan 2018 01:03
URI: http://umpir.ump.edu.my/id/eprint/6349
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